import React, { useState, useMemo } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import {
  FileText,
  Plus,
  Search,
  Filter,
  RefreshCw,
  Edit2,
  Eye,
  Layers,
  Calendar,
  User as UserIcon,
  Tag,
  CheckCircle2,
  AlertCircle,
  Coins,
} from 'lucide-react';
import { Modal } from '../ui/Modal';
import { HelpTooltip } from '../ui/HelpTooltip';
import { useToast } from '../ui/Toast';
import { ExportButton } from '../ui/ExportButton';
import { ExportColumn } from '../../utils/exportUtils';
import { useTableSort, SortableTh } from '../../utils/tableSort';
import {
  Instrument,
  Instruction,
  Programme,
  ActivityStatus,
} from '../../types';
import {
  getAllInstruments,
  createInstrument,
  updateInstrument,
} from '../../services/api';
import {
  getActivityStatusBadge,
  formatDate,
  getUserEmail,
  ACTIVITY_STATUS_OPTIONS,
} from '../../lib/formatters';

const instrumentSchema = z.object({
  programmeId: z.coerce.number().min(1, 'Please select an associated programme'),
  name: z.string().min(3, 'Funding instrument title must be at least 3 characters'),
  code: z.string().optional(),
  description: z.string().min(5, 'Description is required (minimum 5 characters)'),
  status: z.coerce.number(),
});

type InstrumentFormValues = z.infer<typeof instrumentSchema>;

interface FundingInstrumentsSectionProps {
  programmes: Programme[];
  currentUserId: string;
  preselectedProgrammeId?: string | number | null;
  onClearPreselectedProgramme?: () => void;
  isCreateModalOpenExternal?: boolean;
  onCloseCreateModalExternal?: () => void;
}

export const FundingInstrumentsSection: React.FC<FundingInstrumentsSectionProps> = ({
  programmes,
  currentUserId,
  preselectedProgrammeId,
  onClearPreselectedProgramme,
  isCreateModalOpenExternal,
  onCloseCreateModalExternal,
}) => {
  const queryClient = useQueryClient();
  const { success, error: toastError } = useToast();

  const [searchTerm, setSearchTerm] = useState('');
  const [selectedProgrammeFilter, setSelectedProgrammeFilter] = useState<string>(
    preselectedProgrammeId ? String(preselectedProgrammeId) : 'all'
  );
  const [statusFilter, setStatusFilter] = useState<string>('all');

  // Modals
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [editingInstrument, setEditingInstrument] = useState<Instrument | null>(null);
  const [inspectingInstrument, setInspectingInstrument] = useState<Instrument | null>(null);

  // Form setup
  const instrumentForm = useForm<InstrumentFormValues>({
    resolver: zodResolver(instrumentSchema),
    defaultValues: {
      programmeId: programmes[0]?.id ? Number(programmes[0].id) : 0,
      name: '',
      code: '',
      description: '',
      status: ActivityStatus.Active,
    },
  });

  // Sync external create modal trigger if provided
  React.useEffect(() => {
    if (isCreateModalOpenExternal) {
      setEditingInstrument(null);
      instrumentForm.reset({
        programmeId: preselectedProgrammeId ? Number(preselectedProgrammeId) : (programmes[0]?.id ? Number(programmes[0].id) : 0),
        name: '',
        code: '',
        description: '',
        status: ActivityStatus.Active,
      });
      setIsModalOpen(true);
    }
  }, [isCreateModalOpenExternal, preselectedProgrammeId, programmes, instrumentForm]);

  // Query: Get all funding instruments primarily from API
  const {
    data: instruments = [],
    isLoading,
    isFetching,
    refetch,
  } = useQuery({
    queryKey: ['all-instruments', programmes],
    queryFn: () => getAllInstruments(programmes),
  });

  // Programme lookup helper
  const programmeMap = useMemo(() => {
    const map = new Map<string, Programme>();
    programmes.forEach((p) => map.set(String(p.id), p));
    return map;
  }, [programmes]);

  // Mutation: Create or Update Funding Instrument
  const mutation = useMutation({
    mutationFn: async (data: InstrumentFormValues) => {
      if (editingInstrument) {
        await updateInstrument({
          instructionId: editingInstrument.id,
          instrumentId: editingInstrument.id,
          id: editingInstrument.id,
          programmeId: data.programmeId,
          code: data.code,
          name: data.name,
          description: data.description,
          status: data.status !== undefined ? Number(data.status) : ActivityStatus.Active,
          userId: currentUserId,
        });
      } else {
        await createInstrument({
          programmeId: data.programmeId,
          code: data.code,
          name: data.name,
          description: data.description,
          status: data.status !== undefined ? Number(data.status) : ActivityStatus.Active,
          userId: currentUserId,
        });
      }
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['all-instruments'] });
      queryClient.invalidateQueries({ queryKey: ['all-instructions'] });
      queryClient.invalidateQueries({ queryKey: ['instruments'] });
      success(
        editingInstrument ? 'Funding Instrument Updated' : 'Funding Instrument Created',
        editingInstrument
          ? 'Funding instrument record updated successfully via the API.'
          : 'New funding instrument created and linked to strategic programme successfully.'
      );
      setIsModalOpen(false);
      setEditingInstrument(null);
      if (onCloseCreateModalExternal) onCloseCreateModalExternal();
    },
    onError: (err: unknown) => {
      toastError('Save Failed', err);
    },
  });

  // Handlers
  const openCreateModal = (programmeId?: number | string) => {
    setEditingInstrument(null);
    instrumentForm.reset({
      programmeId: programmeId
        ? Number(programmeId)
        : selectedProgrammeFilter !== 'all'
        ? Number(selectedProgrammeFilter)
        : programmes[0]?.id
        ? Number(programmes[0].id)
        : 0,
      name: '',
      code: '',
      description: '',
      status: ActivityStatus.Active,
    });
    setIsModalOpen(true);
  };

  const openEditModal = (inst: Instrument) => {
    setEditingInstrument(inst);
    instrumentForm.reset({
      programmeId: Number(inst.programmeId),
      name: inst.name || '',
      code: inst.code || '',
      description: inst.description || '',
      status: Number(inst.status),
    });
    setIsModalOpen(true);
  };

  const handleCloseModal = () => {
    setIsModalOpen(false);
    setEditingInstrument(null);
    if (onCloseCreateModalExternal) onCloseCreateModalExternal();
  };

  // Filter funding instruments
  const filteredInstruments = useMemo(() => {
    return instruments.filter((inst) => {
      // Programme filter
      if (selectedProgrammeFilter !== 'all' && String(inst.programmeId) !== String(selectedProgrammeFilter)) {
        return false;
      }
      // Status filter
      if (statusFilter !== 'all' && String(inst.status) !== String(statusFilter)) {
        return false;
      }
      // Search term
      if (searchTerm.trim()) {
        const query = searchTerm.toLowerCase();
        const pName = programmeMap.get(String(inst.programmeId))?.name?.toLowerCase() || '';
        const matchTitle = (inst.name || '').toLowerCase().includes(query);
        const matchCode = (inst.code || '').toLowerCase().includes(query);
        const matchDesc = (inst.description || '').toLowerCase().includes(query);
        const matchProg = pName.includes(query);
        if (!matchTitle && !matchCode && !matchDesc && !matchProg) {
          return false;
        }
      }
      return true;
    });
  }, [instruments, selectedProgrammeFilter, statusFilter, searchTerm, programmeMap]);

  // Sorting hook
  const {
    sortedData: sortedInstruments,
    sortColumn: instSortCol,
    sortDirection: instSortDir,
    handleSort: handleInstSort,
  } = useTableSort<Instrument>(filteredInstruments, null, null, {
    code: (inst: Instrument) => inst.code || `INST-${inst.id}`,
    name: (inst: Instrument) => inst.name,
    programmeId: (inst: Instrument) => programmeMap.get(String(inst.programmeId))?.name || `Programme #${inst.programmeId}`,
    status: (inst: Instrument) => getActivityStatusBadge(inst.status).label,
    createdAt: (inst: Instrument) => inst.createdAt,
  });

  // Export columns definition
  const instrumentExportColumns: ExportColumn<Instrument>[] = useMemo(
    () => [
      { header: 'Instrument ID', key: 'id' },
      { header: 'Instrument Code', key: 'code', format: (val) => val || '—' },
      { header: 'Title / Name', key: 'name', format: (val) => val || 'Untitled' },
      {
        header: 'Strategic Programme',
        key: 'programmeId',
        format: (val) => programmeMap.get(String(val))?.name || `Programme #${val}`,
      },
      {
        header: 'Status',
        key: 'status',
        format: (val) => (Number(val) === ActivityStatus.Active ? 'Active' : 'Inactive'),
      },
      { header: 'Description', key: 'description', format: (val) => val || '—' },
      { header: 'Created Date', key: 'createdAt', format: (val) => (val ? formatDate(val) : '—') },
    ],
    [programmeMap]
  );

  return (
    <div className="space-y-4">
      {/* Top Filter and Actions Bar */}
      <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-3 bg-[#0d121f]/90 p-4 rounded-2xl border border-slate-800/80 backdrop-blur-sm">
        <div className="flex flex-col sm:flex-row items-stretch sm:items-center gap-3 flex-1">
          {/* Search Input */}
          <div className="relative flex-1 max-w-md">
            <Search className="w-4 h-4 text-slate-500 absolute left-3 top-3" />
            <input
              type="text"
              placeholder="Search funding instruments by title, code, description, or programme..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="w-full pl-9 pr-4 py-2.5 text-xs bg-[#090d16] border border-slate-700/80 rounded-xl focus:outline-none focus:ring-1 focus:ring-blue-500 text-slate-200 placeholder:text-slate-500 transition shadow-xs"
            />
          </div>

          {/* Programme Filter Dropdown */}
          <div className="flex items-center gap-2">
            <label className="text-xs text-slate-400 whitespace-nowrap flex items-center gap-1 font-medium">
              <Layers className="w-3.5 h-3.5 text-slate-400" />
              Programme:
            </label>
            <select
              value={selectedProgrammeFilter}
              onChange={(e) => {
                setSelectedProgrammeFilter(e.target.value);
                if (onClearPreselectedProgramme && e.target.value === 'all') {
                  onClearPreselectedProgramme();
                }
              }}
              className="px-3 py-2 text-xs bg-[#090d16] border border-slate-700/80 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500 max-w-[200px]"
            >
              <option value="all">All Programmes ({programmes.length})</option>
              {programmes.map((p) => (
                <option key={p.id} value={String(p.id)}>
                  {p.name}
                </option>
              ))}
            </select>
          </div>

          {/* Status Filter Dropdown */}
          <div className="flex items-center gap-2">
            <label className="text-xs text-slate-400 whitespace-nowrap flex items-center gap-1 font-medium">
              <Filter className="w-3.5 h-3.5 text-slate-400" />
              Status:
            </label>
            <select
              value={statusFilter}
              onChange={(e) => setStatusFilter(e.target.value)}
              className="px-3 py-2 text-xs bg-[#090d16] border border-slate-700/80 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500"
            >
              <option value="all">All Statuses</option>
              <option value={String(ActivityStatus.Active)}>Active</option>
              <option value={String(ActivityStatus.Inactive)}>Inactive</option>
            </select>
          </div>
        </div>

        {/* Action Buttons: Refresh, Export & Add */}
        <div className="flex items-center gap-2 self-end lg:self-center">
          <button
            type="button"
            onClick={() => {
              refetch();
              success('Refreshed', 'Funding instruments updated from API.');
            }}
            disabled={isFetching}
            className="inline-flex items-center justify-center gap-1.5 px-3.5 py-2 text-xs font-semibold text-slate-300 bg-[#0d121f] hover:bg-slate-800 border border-slate-700/80 rounded-xl transition cursor-pointer shadow-xs disabled:opacity-50"
            title="Refresh Funding Instruments from API"
          >
            <RefreshCw className={`w-3.5 h-3.5 text-blue-400 ${isFetching ? 'animate-spin' : ''}`} />
            <span>Refresh</span>
          </button>

          <ExportButton
            claim="governance"
            title="Funding Instruments Registry"
            subtitle="Authoritative funding instruments and financing directives attached to strategic programmes"
            filename={`pfm-funding-instruments-${new Date().toISOString().split('T')[0]}`}
            columns={instrumentExportColumns}
            data={filteredInstruments}
          />

          <button
            type="button"
            onClick={() => openCreateModal()}
            className="inline-flex items-center gap-1.5 px-4 py-2 text-xs font-semibold text-white bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-500 hover:to-indigo-500 rounded-xl shadow-md shadow-blue-500/20 transition cursor-pointer"
          >
            <Plus className="w-4 h-4" />
            <span>Add Instrument</span>
          </button>
        </div>
      </div>

      {/* Funding Instruments Table & Cards */}
      <div className="rounded-2xl border border-slate-800/80 bg-[#0d121f]/90 overflow-hidden shadow-xl">
        <div className="p-4 border-b border-slate-800/80 flex items-center justify-between">
          <div className="flex items-center gap-2">
            <Coins className="w-4 h-4 text-blue-400" />
            <h3 className="text-xs font-bold text-slate-200 uppercase tracking-wider">
              Funding Instruments & Financing Directives ({filteredInstruments.length})
            </h3>
            <HelpTooltip
              title="Funding Instruments"
              content="Binding funding instruments and financing directives tied to strategic funding programmes. Defines capital allocation mechanisms, rules, and statutory guidelines."
              placement="right"
              size="sm"
            />
          </div>
          <span className="text-[11px] text-slate-400 font-mono">
            {filteredInstruments.length} of {instruments.length} recorded
          </span>
        </div>

        {isLoading ? (
          <div className="p-12 text-center text-xs text-slate-400 flex flex-col items-center justify-center gap-2">
            <RefreshCw className="w-5 h-5 animate-spin text-blue-400" />
            <span>Loading funding instruments directory...</span>
          </div>
        ) : filteredInstruments.length === 0 ? (
          <div className="p-12 text-center text-xs text-slate-400 space-y-3">
            <div className="text-slate-500">
              {searchTerm || selectedProgrammeFilter !== 'all' || statusFilter !== 'all'
                ? 'No funding instruments match the active filters.'
                : 'No funding instruments registered yet. Link funding instruments to programmes using the button below.'}
            </div>
            <button
              type="button"
              onClick={() => openCreateModal()}
              className="inline-flex items-center gap-1.5 px-4 py-2 text-xs font-semibold text-white bg-blue-600 hover:bg-blue-500 rounded-xl transition cursor-pointer"
            >
              <Plus className="w-4 h-4" />
              Add First Funding Instrument
            </button>
          </div>
        ) : (
          <div className="overflow-x-auto">
            <table className="w-full text-left border-collapse">
              <thead>
                <tr className="border-b border-slate-800/80 bg-slate-900/50 text-[11px] font-semibold text-slate-400 uppercase tracking-wider">
                  <SortableTh column="code" currentColumn={instSortCol} direction={instSortDir} onSort={handleInstSort} className="py-3 px-4">
                    Code / Ref
                  </SortableTh>
                  <SortableTh column="name" currentColumn={instSortCol} direction={instSortDir} onSort={handleInstSort} className="py-3 px-4">
                    Instrument Title
                  </SortableTh>
                  <SortableTh column="programmeId" currentColumn={instSortCol} direction={instSortDir} onSort={handleInstSort} className="py-3 px-4">
                    Associated Programme
                  </SortableTh>
                  <SortableTh column="status" currentColumn={instSortCol} direction={instSortDir} onSort={handleInstSort} className="py-3 px-4">
                    Status
                  </SortableTh>
                  <SortableTh column="createdAt" currentColumn={instSortCol} direction={instSortDir} onSort={handleInstSort} className="py-3 px-4">
                    Created Info
                  </SortableTh>
                  <th className="py-3 px-4 text-right">Actions</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-slate-800/60 text-xs text-slate-300">
                {sortedInstruments.map((inst) => {
                  const statusBadge = getActivityStatusBadge(inst.status);
                  const parentProg = programmeMap.get(String(inst.programmeId));

                  return (
                    <tr key={inst.id} className="hover:bg-slate-800/30 transition-colors">
                      <td className="py-3.5 px-4 font-mono font-bold text-blue-400">
                        <span className="bg-blue-500/10 px-2 py-0.5 rounded border border-blue-500/20 text-[11px]">
                          {inst.code || `INST-${inst.id}`}
                        </span>
                      </td>
                      <td className="py-3.5 px-4">
                        <div className="font-semibold text-white max-w-sm">{inst.name}</div>
                        {inst.description && (
                          <div className="text-[11px] text-slate-400 line-clamp-1 mt-0.5 max-w-md">
                            {inst.description}
                          </div>
                        )}
                      </td>
                      <td className="py-3.5 px-4">
                        {parentProg ? (
                          <span className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded-lg text-xs bg-slate-800/80 text-slate-200 border border-slate-700 font-medium">
                            <Layers className="w-3 h-3 text-blue-400" />
                            {parentProg.name}
                          </span>
                        ) : (
                          <span className="text-slate-500 font-mono text-xs">
                            Programme #{inst.programmeId}
                          </span>
                        )}
                      </td>
                      <td className="py-3.5 px-4">
                        <span
                          className={`inline-flex items-center px-2 py-0.5 rounded-full text-[10px] font-semibold border ${statusBadge.className}`}
                        >
                          {statusBadge.label}
                        </span>
                      </td>
                      <td className="py-3.5 px-4 text-[11px] text-slate-400 font-mono">
                        <div>{formatDate(inst.createdAt)}</div>
                        {inst.createdBy && (
                          <div className="text-[10px] text-slate-500">{getUserEmail(inst.createdBy)}</div>
                        )}
                      </td>
                      <td className="py-3.5 px-4 text-right">
                        <div className="flex items-center justify-end gap-1.5">
                          <button
                            type="button"
                            onClick={() => setInspectingInstrument(inst)}
                            className="inline-flex items-center gap-1 text-xs font-semibold text-cyan-400 hover:text-white bg-cyan-500/10 hover:bg-cyan-500/20 border border-cyan-500/30 px-2.5 py-1 rounded-lg transition shadow-xs cursor-pointer"
                            title="Inspect Instrument"
                          >
                            <Eye className="w-3 h-3" />
                            Inspect
                          </button>
                          <button
                            type="button"
                            onClick={() => openEditModal(inst)}
                            className="inline-flex items-center gap-1 text-xs font-semibold text-slate-200 hover:text-white bg-slate-900/80 hover:bg-slate-800 border border-slate-700/80 px-2.5 py-1 rounded-lg transition shadow-xs cursor-pointer"
                            title="Edit / Update Instrument"
                          >
                            <Edit2 className="w-3 h-3" />
                            Edit
                          </button>
                        </div>
                      </td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </div>

      {/* Modal: Create / Edit Funding Instrument */}
      <Modal
        isOpen={isModalOpen}
        onClose={handleCloseModal}
        title={editingInstrument ? 'Edit Funding Instrument' : 'Add New Funding Instrument'}
        subtitle={
          editingInstrument
            ? `Updating Instrument ${editingInstrument.code || `#${editingInstrument.id}`}`
            : 'Authoritative funding instrument attached to a strategic programme'
        }
        helpText="Funding instruments operationalize funding programmes into concrete financing mechanisms. Select a strategic programme from the dropdown."
      >
        <form
          onSubmit={instrumentForm.handleSubmit((data) => mutation.mutate(data))}
          className="space-y-4"
        >
          {/* Associated Programme Dropdown */}
          <div>
            <div className="flex items-center gap-1 mb-1">
              <label className="block text-xs font-semibold text-slate-300">
                Associated Programme *
              </label>
              <HelpTooltip
                title="Associated Programme"
                content="Select the strategic funding programme under which this operational funding instrument is established."
                size="sm"
              />
            </div>
            <select
              {...instrumentForm.register('programmeId')}
              className="w-full px-3 py-2 text-xs bg-[#090d16] border border-slate-700 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500"
            >
              <option value="">Select an associated programme...</option>
              {programmes.map((p) => (
                <option key={p.id} value={Number(p.id)}>
                  {p.name}
                </option>
              ))}
            </select>
            {instrumentForm.formState.errors.programmeId && (
              <p className="text-red-400 text-[11px] mt-1">
                {instrumentForm.formState.errors.programmeId.message}
              </p>
            )}
          </div>

          {/* Title */}
          <div>
            <div className="flex items-center gap-1 mb-1">
              <label className="block text-xs font-semibold text-slate-300">
                Instrument Title *
              </label>
              <HelpTooltip
                title="Instrument Title"
                content="Formal title of the funding instrument (e.g., SME Technology Transfer Subsidy Guideline)."
                size="sm"
              />
            </div>
            <input
              type="text"
              placeholder="e.g. Clean Energy Grant Directive 2026"
              {...instrumentForm.register('name')}
              className="w-full px-3 py-2 text-xs bg-[#090d16] border border-slate-700 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500"
            />
            {instrumentForm.formState.errors.name && (
              <p className="text-red-400 text-[11px] mt-1">
                {instrumentForm.formState.errors.name.message}
              </p>
            )}
          </div>

          {/* Code */}
          <div>
            <div className="flex items-center gap-1 mb-1">
              <label className="block text-xs font-semibold text-slate-300">
                Instrument Code (Optional)
              </label>
              <HelpTooltip
                title="Instrument Code"
                content="Unique operational reference code (e.g., INST-CE-001). If left blank, one is generated automatically."
                size="sm"
              />
            </div>
            <input
              type="text"
              placeholder="e.g. INST-CE-001"
              {...instrumentForm.register('code')}
              className="w-full px-3 py-2 text-xs bg-[#090d16] border border-slate-700 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500 font-mono"
            />
          </div>

          {/* Description */}
          <div>
            <div className="flex items-center gap-1 mb-1">
              <label className="block text-xs font-semibold text-slate-300">
                Description & Financing Directives *
              </label>
              <HelpTooltip
                title="Instrument Description"
                content="Comprehensive directives, statutory mandate, eligibility scope, and financing guidelines."
                size="sm"
              />
            </div>
            <textarea
              rows={4}
              placeholder="Detail the financing mandate, eligibility scope, disbursement triggers, and statutory compliance requirements..."
              {...instrumentForm.register('description')}
              className="w-full px-3 py-2 text-xs bg-[#090d16] border border-slate-700 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500"
            />
            {instrumentForm.formState.errors.description && (
              <p className="text-red-400 text-[11px] mt-1">
                {instrumentForm.formState.errors.description.message}
              </p>
            )}
          </div>

          {/* Status */}
          <div>
            <div className="flex items-center gap-1 mb-1">
              <label className="block text-xs font-semibold text-slate-300">Status</label>
              <HelpTooltip
                title="Instrument Lifecycle Status"
                content="Indicates whether this funding instrument is actively enforceable or archived/inactive."
                size="sm"
              />
            </div>
            <select
              {...instrumentForm.register('status')}
              className="w-full px-3 py-2 text-xs bg-[#090d16] border border-slate-700 rounded-xl text-slate-200 focus:outline-none focus:ring-1 focus:ring-blue-500"
            >
              {ACTIVITY_STATUS_OPTIONS.map((opt) => (
                <option key={opt.value} value={opt.value}>
                  {opt.label}
                </option>
              ))}
            </select>
          </div>

          {/* Footer Actions */}
          <div className="pt-3 border-t border-slate-800 flex justify-end gap-2">
            <button
              type="button"
              onClick={handleCloseModal}
              className="px-4 py-2 text-xs font-semibold text-slate-300 bg-slate-800 hover:bg-slate-700 rounded-xl transition cursor-pointer"
            >
              Cancel
            </button>
            <button
              type="submit"
              disabled={mutation.isPending}
              className="inline-flex items-center gap-1.5 px-4 py-2 text-xs font-semibold text-white bg-blue-600 hover:bg-blue-500 rounded-xl shadow-md transition disabled:opacity-50 cursor-pointer"
            >
              {mutation.isPending && <RefreshCw className="w-3.5 h-3.5 animate-spin" />}
              {editingInstrument ? 'Save Instrument Changes' : 'Create Funding Instrument'}
            </button>
          </div>
        </form>
      </Modal>

      {/* Modal: Inspect Funding Instrument Detail */}
      {inspectingInstrument && (
        <Modal
          isOpen={!!inspectingInstrument}
          onClose={() => setInspectingInstrument(null)}
          title={`Funding Instrument: ${inspectingInstrument.name || ''}`}
          subtitle={`Reference: ${inspectingInstrument.code || `INST-${inspectingInstrument.id}`}`}
          maxWidth="lg"
        >
          <div className="space-y-4 text-xs">
            <div className="p-4 rounded-xl border border-slate-800 bg-[#0d121f] space-y-3">
              <div className="flex items-center justify-between">
                <span className="font-mono text-xs font-bold text-blue-400 bg-blue-500/10 px-2.5 py-1 rounded border border-blue-500/20">
                  {inspectingInstrument.code || `INST-${inspectingInstrument.id}`}
                </span>
                {(() => {
                  const badge = getActivityStatusBadge(inspectingInstrument.status);
                  return (
                    <span
                      className={`inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-semibold border ${badge.className}`}
                    >
                      {badge.label}
                    </span>
                  );
                })()}
              </div>

              <div>
                <h4 className="text-sm font-bold text-white mb-1">{inspectingInstrument.name}</h4>
                <p className="text-slate-300 whitespace-pre-wrap leading-relaxed">
                  {inspectingInstrument.description || 'No detailed description provided.'}
                </p>
              </div>

              <div className="pt-3 border-t border-slate-800/80 grid grid-cols-2 gap-3 text-[11px]">
                <div>
                  <span className="text-slate-500 block">Associated Programme</span>
                  <span className="text-slate-200 font-semibold">
                    {programmeMap.get(String(inspectingInstrument.programmeId))?.name ||
                      `Programme #${inspectingInstrument.programmeId}`}
                  </span>
                </div>
                <div>
                  <span className="text-slate-500 block">Created On</span>
                  <span className="text-slate-200 font-mono">
                    {formatDate(inspectingInstrument.createdAt)}
                  </span>
                </div>
                <div>
                  <span className="text-slate-500 block">Created By</span>
                  <span className="text-slate-200 font-mono">
                    {inspectingInstrument.createdBy ? getUserEmail(inspectingInstrument.createdBy) : '—'}
                  </span>
                </div>
                {inspectingInstrument.updatedAt && (
                  <div>
                    <span className="text-slate-500 block">Last Mutated</span>
                    <span className="text-slate-200 font-mono">
                      {formatDate(inspectingInstrument.updatedAt)}
                    </span>
                  </div>
                )}
              </div>
            </div>

            <div className="pt-2 border-t border-slate-800 flex justify-between items-center">
              <button
                type="button"
                onClick={() => {
                  const inst = inspectingInstrument;
                  setInspectingInstrument(null);
                  openEditModal(inst);
                }}
                className="inline-flex items-center gap-1.5 px-3 py-1.5 text-xs font-semibold text-slate-200 bg-slate-800 hover:bg-slate-700 rounded-xl border border-slate-700 cursor-pointer"
              >
                <Edit2 className="w-3.5 h-3.5" />
                Edit Funding Instrument
              </button>
              <button
                type="button"
                onClick={() => setInspectingInstrument(null)}
                className="px-4 py-2 text-xs font-semibold text-slate-300 bg-slate-800 hover:bg-slate-700 rounded-xl cursor-pointer"
              >
                Close
              </button>
            </div>
          </div>
        </Modal>
      )}
    </div>
  );
};

export const InstructionsSection = FundingInstrumentsSection;